Add README for RESTMessageV2 GET with backoff and telemetry

This README explains how to use the RESTMessageV2 GET helper for handling API throttling, telemetry, and pagination.

Author: hanna-g-sn

Integration/RESTMessageV2/GET with backoff, telemetry, and simple pagination/README.md

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+# RESTMessageV2 GET with backoff, telemetry, and simple pagination
+
+## What this solves
+External APIs frequently throttle with HTTP 429 or intermittently return 5xx. This helper retries safely, honours Retry-After, logs simple telemetry, and follows a links.next pagination model.
+
+## Where to use
+Script Include can be called from Scheduled Jobs, Flow Actions, Business Rules, or Background Scripts.
+
+## How it works
+- Executes RESTMessageV2 requests
+- On 429 or 5xx, sleeps using Retry-After or exponential backoff
+- Collects minimal telemetry about attempts and total sleep time
+- Appends items from json.items and follows json.links.next
+
+## References
+- RESTMessageV2 API  
+  https://www.servicenow.com/docs/bundle/zurich-api-reference/page/app-store/dev_portal/API_reference/RESTMessageV2/concept/c_RESTMessageV2API.html
+- Direct RESTMessageV2 example  
+  https://www.servicenow.com/docs/bundle/zurich-api-reference/page/app-store/dev_portal/API_reference/RESTMessageV2/reference/r_DirectRESTMessageV2Example.html
+- Inbound rate limiting and Retry-After header  
+  https://www.servicenow.com/docs/bundle/zurich-api-reference/page/integrate/inbound-rest/concept/inbound-REST-API-rate-limiting.html